Suction-controlling device



L. J. DELLERT.

SUCTION CONTROLLING DEVICE.

APPLICATION FILED OCT. 28. 1919.

1,349,499, Patented Aug. 10, 1920.

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/ VA A ATTORNEYS L. .l. BELLE RT- SUCTlDN CONTROLLING DEVlCE.

APPLlCATlON FILED ocr,2a.1919.

Patented Aug. 10, 1920.

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INVENTOR ATTORNEYS L. J DELLERT.

SUCTION CONTROLUNG DEVICE.

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[NI/EN TOR LJ 062L597 ATTORNEYS WI TNESSES UNITED STATES LOUIS J. DELLER'I, OF BROOKLYN, NEW YORK.

SUCTION-CONTROLLING DEVICE.

Application filed October 28, 1919.

To (/7) "whom it may camera:

Be it known that l, LHLIS J. Dnnmcirr, a citizen of the Fnited States, and a residcnt of the city of New York, borough of Brooklyn in the county of Kings and State of Yew York, have invented a new and Improved Suctionkmtrolling Device, of which the following is a full. clear, and exact description.

The invention relates to grinding and polishing machines having a plurality of grinding or polishing wheels provided with dust receiving hoois connected by branch pipes with a main suction duct connected with a suction fan to produce a suction in the said hoods with a view to carry off the dust and other particles, arising by the grinding and polishing operation. to protect the workmen against inhaling the said particles.

The object of the invention is to provide a new and improved suction controlling de vice arranged to concentrate the suction action of the suction fan to the hood of the grinding wheel used at the time to ef fectively carry off the dust or other particles.

.\nother object is to keep the branch suction pipes normally closed to the main suction pipe thus providing a strong suction action at any one of the grinding wheels whcm-vcr the latter is used. without requiring an increase in the power of the suction fan.

Another object is to permit of readily applying the suction controlling device. to grinding and polishing machines of the type mentioned.

/Vith these and other objects inview, the invention consists of certain novci features of construction as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is re n'esented in the accompanying drawings forming a part of this specification in which similar characters of reference indicate. corresponding parts in all the views.

Figure l is a front elevation of a grinding machine provided with the improved suction controlling device;

Fig. 2 is an enlarged cross section of the same on the line 2-2 of Fig. 1;

Fig. 3 is a sectional side elevation of the same;

Fig. 4 is an enlarged sectionai side elevation of the same the grinding wheel shaft Specification of Letters Patent.

Patented Aug. 10, 1920.

Serial No. 333,913.

and portion of a grinding wheel being shown in elevation;

Fig. 5 is a cross section of the same on the line 5-5 of Fig. 3;

Fig. (3 is a sectional side elevation of the same with the parts in inactive position the grinding wheel shaft and portion of a gripdmg wheel hemg shown in elevation; am

Fig. 7 is a cross section of the same on the line. 77 of Fig. 6, with the parts in active position.

The grinding and polishing machine illustrated in Fig. i is mounted on a suitably constructed frame if), in the lower portion of which is journaled a main driving shaft ll connected with a motor or other suitable means for rotating the said main shaft ll. ()n the shaft 11 is secured a pulley 12 connected by a belt I3 with a pulley 14 secured on the grinding wheel shaft 15 journaied in the. upper portion of the frame 10 and carrying a plurality of grinding or polishing wheels 16 of various forms and shapes, to permit of carrying on various grindingand poiishing operations. Each of the grinding wheels 16 is provided with a suction hood 20 connected by a branch pipe 21 with a main suction pipe or duct 22 provided at one end with a suction fan 23 for producing a suction in the suction pipe 22 and in the hoods 20. as hereinafter more fully described. l he shaft 24 of the fan 2 is provided with a. pulley 25 connected by a belt 26 with a pulley 27 on the main shaft 1] so that when the latter is rotated a rotary motion is given to the suction fan 23 for the purpose above mentioned. Tt is understood that the suction fan 23 carries the dust and other particles arising from the grinding and polishing operations on the grinding wheels 16 to a suitable place of discharge. thus preventing the workmen from inhaling the dust or particles.

The branch pipes 21 are normally closed to the main suction duct 22 and for this purpose each branch pipe 21 is provided with a self-closing valve 30 secured on a. shaft 31 journaled in the sides of the corresponding branch pipe 21. One outer end of the shaft 31 is provided with an arm 32 connected with a spring 33 for normally holding the valve 30 in a closed position. The arm 32 is also connected by a link 34 with an arm 35 forming part of a lever having a sleeve 36 mounted to turn on a rod 37 held in brackets 38 attached to the suction hood 20. The lever sleeve36 is provided with arms 39 straddling the shaft 15 and engaged by a coupling cam sleeve 40 mounted to turn with and to slide longitudinally on the shaft 15. The couplin cam sleeve 40 is provided with a longitu inally extending slot 41 through which projects a pin 42 cured to the rinding wheel shaft 15 and to the outer on of this pin 42 issecured one end of a coil spring 45 secured at its other end to a tubular shell 46 secured to an abutment flange 47 fastened by screws 28 or other suitable fastening devices to one face of the corresponding grinding wheel 16. The abutment flange 47 is provided at its inner wall with an abutment 48 engaging the inner cam face 49 of thecoupling cam sleeve 40 to shift the latter lengthwise on the shaft 15 as hereinafter more fully explained, it being, however, understood that the cam sleeve 40 is normally in the position shown in Fig. 6, that is, when the valve 30 is in closed position in the branch pipe 31. From the foregoing it will be seen that by the arrangement described a yielding connectionis had between the grinding wheel shaft 15 and each of the grinding wheels 16 mounted to rotate loosely on the shaft 15. Now when an article to be ground or polished is moved in frictional contact with the grinding surface of any one of the grinding wheels 16 then such grinding wheel 16 is momentarily retarded in its rotary motion owing to the yielding connection with the shaft 15.

, The shaft 15 on account of being continually driven carries along the coupling cam sleeve 40 by the pin 42 and hence the cam face 49 of this coupling cam sleeve 40 travels along the abutment 48 and the coupling cam sleeve 40 is moved from the right to the left into the position shown in Figs. 3 and 4. This movement of the coupling cam sleeve 40 imparts a rocking motion to the arms 39 whereby the arms 35 are swung upward and in doing so the link 34 exerts an upward pull on the arm 32 whereby the valve 30 is swung from its normal closed sition into open position as illustrated in *igs. 2 and 3. As soon as the valve 30 moves into open pos1- tion a suction is produced in the corres 0nding hood 20 of the grinding wheel 6 on which a grinding or polishing operation is carried on and consequently the full force of the suction fan 23 is utilized to produce a strong suction action in this hood 20 to draw in dust or other particles and to carry off the same by way of the corresponding branch pipe 21 and the main suction pipe 22. It is understood that by the arrangement described the spring 45 1S placed under tension and when the article is removed from the grinding surface of the grinding wheel 16 then thespring rotates the grinding wheel 16 at an accelerated speed until it assumes its normal osition relative to the grinding wheel sha 15. This movement of the grinding wheel 16 returns the abutment to its normal position, shown in Fig. 6, thus allowing the' coupling cam sleeve 40 to move from the left to the right back to its normal position and thereb allow the valve 30 to return to closed position in the,branch pipe 21. It is understood 'that the self-closing valve 30 returns the lever formed of the arms 35, sleeve 36 and arms 39 to normal position with the arms 39 pushing the coupling cam sleeve 40 back from the position shown in Figs. 3 and 4 to the position shown in Fig. 6.

In order to limit the yielding turning movement of the grinding wheel 16 relative to the shaft 15, the following arrangement is made: In the outer end of the tubular shell 46 is arranged a rirg 50 in the peripheral face of whlch is secured one end of a coil spring 51 secured with itsother end 52 in one of a series of apertures 53 on the shell 46 (see Figs. 4 and 5). The ring 50 rotates with the shell and the ring is provided with a stop 54 projecting into the path of the outer end of the pin 42 to limit the turning movement of the wheel 16 relative to the shaft 15, as will be readily understood by I reference to Figs. 5 and 7 will be noticed that by engaging the end 52 of the spring 51 with a corres onding aperture 53 the tension of the spring 45 can be regulated to insure proper yielding movement of the wheel 16 relative to the shaft 15 according to the retarded action given to the wheel 16 by the work pressed with more orless force in contact with the grinding surface of the grinding wheel 16.

It is expressly understood that the several branch pipes 21 are normally closed to. the main suction duct 22 by the self-closing valves 30 and only when an article to be ground or polished is moved into contact with a grindin wheel is the branch pipe 21 of the hood or'this particular grinding wheel opened to the main duct 22' to produce a forceful suction action in this hood. Thus it will be seen that without increasing the power of the suction fan 23 a more powerful suction action is had in the hood of any one of the grinding wheels 16 as soon ing branch pipe to the main suction pipe,

each controlling device having actuating means connected with the said closing means and controlled by the corresponding grinding wheel to move the closing means into open osition on applying an article to the grinding wheel.

2. In a grinding machine, a driven shaft, a plurality of grinding wheels mounted to turn loosely on the said shaft, a yieldi coupling connecting each grinding whee with the said shaft, a main suction pipe provided with branch pipes terminating in suction hoods, one for each grinding wheel, a closin device in each branch pipe to normally c ose-the latter to the main suction pipe, and actuating means connected with the said closing means and controlled by the said coupling.

3. In a grinding machine, a driven shaft, a grindin wheel mounted to rotate loosely on the sai shaft, a suction hood for the said grinding wheel and provided with a branch pipe connected with a main suction pipe, a closing means in the said branch pipe to normally close the same to the main suction pipe, a coupling cam sleeve mounted to slide on and to rotate with the said shaft, a spring connecting the said shaft with the said grinding wheel, an abutment on the said wheel engaging the said coupling cam sleeve to shift the latter on the shaft on retarding the motion of the grinding wheel by applying an article to be ound or polished to the grinding wheel, a iver controlled by the said coupling cam sleeve, and a connection between the said lever and the said closin means.

4. n a grinding machine, a driven shaft, a grindin wheel mounted to rotate loosely on the said shaft, a suction hood for the said grinding wheel and provided with a branch ipe connected with a main suction pipe, a c osing means in the said branch pipe to normally close the same to the main suction pipe, 3, pin on the said shaft, a coupling cam sleeve having a longitudinal slot through which extends the said pin, an abutment attached to the said rinding wheel and engaging the said coupling cam sleeve, a spring attached at one end to the said pin and at the other end to the said abutment, a lever having one end engaged by the said coupling cam sleeve, and a connection connecting the other end of the lever with the said closing means.

5. In a grinding machine, a driven shaft, a grindin wheel mounted to rotate loosely on the sai shaft, a suction hood for the said grinding wheel and provided with a branch pipe connected with a main suction pipe, a closing means in the said branch pipe to normally close the same to the main suction pipe, a coupling cam sleeve mounted to slide on and to rotate with the said shaft, :1 spring connecting the said shaft with the said grinding wheel, an abutment on the said wheel engaging the said couplingcam sleeve to shift the latter on the shaft on retarding the motion of the grinding wheel by applying an article to be ground or polished to the grinding wheel, a lever controlled by the said coupling cam sleeve, a connection between the said lever and the said closing means, and means for ad'usting the said spring to vary the tension t ereof.

6. In a grinding machine, a driven shaft, a grinding wheel mounted to rotate loosely on the said shaft, a suction hood for-the said grinding wheel and provided with a branch pipe connected with a main suction pipe, a closing means in the said branch pipe to normally close the same to the main suction pipe, a yielding coupling connecting the said grinding wheel with the said shaft, an

actuating device connected with the said closing means and controlled by the said coupling, andmeans to limit the yielding IIIIIOtflOII of the grinding wheel relative to its s a t. I

LOUIS J. DELLERT. 

